Draft regulator



Sept. 21, 1943. P. WINGERT 2,329,963

DRAFT REGULATOR Filed NOV. 16, 1942 2 Sheets-Sheet l Sept. 21, 1943.

P. WINGERT DRAFT REGULATOR Filed Nov. 16,

1942 2 Sheets-Sheet 2 ratedtherein:

Patented Sept. 21, 1943 STATES PATENT GFE' mmmnmcmron Paul Wingerf; Montpelier, can Anplioati'onNovemlicn 16, 194,2,{SbriaLNor stasis 11 Claims. (or: ass-96) This invention relates to improvements in primary drafii'negulators: for stoves and? furnaces.

The main? o'bjlectsrof. theme-1:01pmvide" an. improved draft regulator: for stoves and furnaces; to' provide: a: draft; regulator" which is subject to the. temperatures of? the jackethnri ng or'shell of stoves andl furnaces;- to provide a;- re'guiat'orr oi'e this" characterv which is secured to the ash: pit door; and arranged to: be manually shiftable: about a: pivot to set the regulator any predetermined: position with: respect to the jacket liniingior shell to'providei a thermostatic device. for actuatin gfthe primary draft' d'oor' ofav stove; or: furnace;' and: to provide a regulator of the class describe'diwhich iscompa'ct; simple in construction and:inexpensive to manufacture Il'lustrative embodiments of: this-invention are shown: in: the accompanying drawings inwhich Fig; 1: is a frontipl'arnt views, with. parts shown broken away, of my improvedregulatorand' show"-' ing it. mounted on' an ash: pit doom of' a -stove or furnace: v 1

Fig, 2.- i-s a cross-sectional View taken onthe lilfl'61Z- -2'Of 1. 4

Big. 3 is a vertical crosses'ectional' vtew of a modifiedifornr OfIIIlY-iI IVEHtlOIIJ r Fig; 4 isatop plan: View of'tlre' device shown in Figs 3':

Fig: 5 is a. verticall sectional? view of a still further modified .form ofimy invention;

Referring; to thet'emhodiment of inven' tion'which isrshovm'in' Figs. 1 and? onlythe lower-front portion of' the? stove is illustrated' and: comprises a* shell or casing l; and: ashpit door 2 having a primary draftdoorfi ineorpo-- The" ashpit: door 2 is pivotally secured toe the'do'or frame"=4:-by means- 01 pivot bolts 5;: and is secureditotheshell or ca'slng of the. stove in 1tloevusual.- manner: The stove as awhole-is' supported by legssfi to space-the stove above the fioorline and provide for ready air circulation; I

The. primarydrait: damper door" 3 is? ptvotaliy secured to the-ashpi'tidoor Zby meanswf ptvot bolts- 1 'which arezthreadedithrough" ears'v 8 amh91 contained on the doors 3 and 2irespectivelm The mechaxrism comprising: the thermostatic control device comprises a: pair foii verticallyiexs tending arms 5 8: and H each providedzwith limwardl'y extendinghubsnmg" l3 and bosses M- and. l5 respectivelsu The lower ends-"of armsilfl. and I l arearranged 1 to be; inserted between: the up standing .perforatedzears' lfi and lhlo'cated orr the upper edgeot the ashpitr door-l andibre pivotally; secured ltheretowby means of the-spindlebelt Mk. To insure a tight friction: fit a lock washer-w L9 'is inserted. between-the inner faces of hubs- Ids-4 dt-andiisthreaded:onbelt 18.- The-mpper' ends of the arm-slo 'ami H are secured together, by the. tie bolt, 20; tea-holds the arms in parallel, relationsl'li to each others I Thabosses lt and: 15- are each cleft endwise fromtheir, innen faces aslshowns by the numerals 21- and 22 for the'receptiont and. retentionot the inner end 23 of the temperature responsive device which; in this instance" is a bimetallic coil 2'41 Theinnerend nortionliot coill lis secured to and retainedhi-the. cleits 2i22l of thevbosses l3 ll5 respectively\ by compression-0i the arms H11 and ML whenithe armsarettiedin position by bolt 24!,- Flier outer orfifree. end- 25 of 'coilf M is. Bent. sulist'antially at-riglit angles to thelcoil 24C andli-s provided with. an aperture through which, the upper endofl'rod la is inserted.- The upper endofmdfifi, externally threaded. at 2'1 and apair. oflnutsl 2'3 are threadedtlziereon, one disposed. on each side. of the end. portion 250i coilfZll Thelowen nut zai'saspaced a short distance 7 from the lowergface of 1' theflend portion 2.511 prevents the rodZfi'ij from hecoming disen. gaged" from the, c'oiYZli 'Ihelower .end'I ZH-oi'the r0d 26 is Kent at. rightan'gIe's thereto. and'the'jend 29 is inserted in c the" perforation- 36. of the ear 3IIocatect'on thepriinary diattCdoor: This provides a direct? connection? between the." therm'o stcticenmemnrrctheprima ydraftsur whereby uponiexbansion or'contraction' of the coil-Z4; the end portion 2'5 willf'fie' moved upwardly- 0r downwardly and consequently actuate the pri' mary di'aft doorw tb onn onclo'se the same.

It will" readily be understood that --11jion contraction of the'coiI Z'4} theend' p'orti-o'n 2-5 of said coil will move inaniupwardly'direetion causing trieoiait dcor arte open and permit fresh air to enter the fire pct stimulate" burning in" the stove. Assthexfirerburns therheat madia'ted'from the stove jacket will'aflect the'bhfietallic elements of the coil 24 and cause the coil to expand, thereby: moving theend-portion 25-in a downwardly I direction-to close the primary.- drattdoor: 3-; Upon cooling; of: the stove the coil =2 4 will contractand' move-the end'porticniid in an upwardly direction; and therebytopenthadrait'door 31 l v Additional control of the-thermostatic element: may: be had by manuallyrshiftinge the arms 'l fl-and l I; as a-unit; forwardly about the spindle] 8-." The distancectheccoil. 24-is moved away from the stoveisdependen-t-upon the willof-the operator of the stoves The greater the distance the coil ismoved away from the stovegthe greater the-distance the heat radiated from the stove or furnace shell must travel to actuate the thermostatic element. Hence the burning rate of the fuel in the stove is slower when the coil is positioned away from the stove shell and considerably faster when the coil is positioned closer to the shell.

In the modified form of construction as shown in Figs. 3 and 4, I have placed a housing or cover 32 over the entire thermostatic control device to enclose and envelop the same and thereby enhance the general appearance of the stove. The housing 32 is provided with an elongated slot 33 so as to allow for ready movement of rod 26 since the rod must extend therethrough for actuation of the primary draft damper. The arm I l is provided with a vertically extending handle bar 34 which is arranged to extend through the slot 35 contained in the upper wall of the housing 32. The upper wall is also providedwith a series of notches 36 which terminate in and form a part of the slot 35. The spacing of notches 36 is calibrated by the manufacturer and Placed in a predetermined position according to his standard of stove consumption control and hence temperature control. Each of the notches may then be given a value. By this simple means the rate of burning of the fuelin the stove is under the direct control of the'user of the stove by the mere shifting of the handle 34 and hence the coil, to any position desired. y

In the modification shown inFig. 5, I show another manner of setting the arms l and l I to accomplish the same general result as the apparatus disclosed in Figs. Band 4 except that I employ a steep pitched adjusting screw 3l, the shank 38 of which is mounted in the hollow boss 39 and is rotatable therein. The shank 38 is provided with a channel 40 into which the inwardly turned ends 4| of the boss 39 are arrangedto seat. An internally threaded boss 42 is'secured to the arm ,I I into which the screw 31 is threaded. It can readily be seen thatby turning theknurled head of the screw 31 the arm l'l. may be adjusted with respect to the stove shell to set the thermostatic element in ,any position desired, either away from or closer to the stove jacket.

In both of the modifications the'cover-plates are secured to the ashpitdoor in any suitable manner to retain, them I in position. In both modificationsI have shown them secured to the ashpit door 2 by screws. 43-44 respectively.

In all the embodiments shown it will be apparent that the draft controldevice shifts as a unit with the opening or closing of the ashpit door 2, and in the embodiments shownin Figs. 3 to the housings 32 also moveasaunit with the opening or closing of the ashpit door 2.

It is to be understood that some of the details set forth may be altered or omitted without departing from the spirit of my invention as defined by thefollowing claims.

I claim: i

"1. In a stove-or furnace having a jacket, an ashpit, an ashpit door and a primary draft door hingedly connected to said ashpit door, a draft regulator therefor comprising a pair of verti-' cally extending parallelly spaced arms pivotally secured at their lower ends to the ashpit door, a thermostatic coilpositioned between the upper ends of said arms'an'd having its inner end secured to said arms, the free end of saidcoil pro jecting laterally therefrom, a connecting rod secured at one end to said free end of said coil and at'the other end to said primary draft door for actuation of said draft door upon expansion and contraction of said coil,

2. A device of the character described in claim 1 wherein said arms are adapted to be manually shifted about said pivot toward or away from said jacket and means for retaining said arms in any position to which said arms are shifted.

3. A regulator device for stoves and furnaces having an ash pit door comprising a pair of vertically extending, parallelly spaced arms pivotally secured at their lower ends to said ashpit door, a primary draft door embodied in said ashpit door, a thermostatic coil secured between said arms adjacent the upper ends thereof, and link means between said thermostatic coil and said draft door, the upper end of said link means being secured to one end of said thermostatic coil and the lower end of said link means being secured to said draft door whereby said draft door'is actuated upon expansion and contraction of said coil.

4. A device of the character set forth in claim 3 wherein the thermostatic coil is secured to the free end of said arms and said arms are adapted I to be manually shifted about said pivot for positioning and setting the coil with respect to the stove or furnace shell.

5. In a stove or furnace having a jacket, an ashpit door and a primary draft door hingedly connected to said ashpit door, a draft regulator therefor comprising a pair of vertically extending parallelly spaced arms, each arm being provided with an inwardly extending tapered boss located adjacent the upper end thereof, and cleft endwise from the face ends thereof, the free ends of each of said bosses arranged for abutting engagement face to face, an inwardly extending hub on the lowest ends of each arm, a pair of vertically extending spaced ears integrally secured to the upper edge of said ashpit door located, substantially medially of the ends of said door, spindle means for pivotally securmg the lower ends of said arms between and to said ears, means to secure said arms in parallel relationship to each other, a thermostatic coil surrounding said bosses, the inner end of said 0011 being adapted to seat in the clefts of said bosses and be secured therein, the free end of sa d coil extending laterally beyond the body of said coil, and a connecting rod secured at one end to said free end of said coil and the other end to said draft door, whereby upon contraction or expansion of said coil due to temperature changes of said jacket said draft door will be actuated thereby.

6. Apparatus according to claim 5 wherein a' friction element is provided between the face ends of said hubs whereby said arms may be shifted about said spindle and be frictionally held in any position to which the arms are shifted.

7. Apparatus according to claim 5 wherein the draft regulator is contained within a housing which envelops said regulator, and means for manually shifting and setting said arms located outside of said housing.

8. A regulator device for stoves and furnaces havingan ashpit door comprising a pair of vertically extending, parallelly spaced arms pivotally secured at the lower ends to said ashpit door,la primary draft door embodied in said ashpit door, a temperature responsive device secured between the upper ends of said arms, and link means between said temperature responsive device. and saiddraft door, the upper end of said link means being secured to said temperature responsive device and the lower end of said link meansbeing secured to said draft door whereby upon movement of said temperature responsive device said draft door is actuated.

9. In a stove orfurnace having 'a jacket, a primary draft door hingedly connected to said jacket, a draft regulator therefor comprising a pair of vertically extending parallelly spaced arms pivotally secured at their lower ends to the outer wall of said jacket, a thermostatic coil positioned between the upper ends of said arms and having its inner end secured to said arms,

the free end of said coil projecting laterallyouter wall of said jacket, a thermostatic coil positioned between the freeends of said arms and having itsinner end secured to said arms, the free end of said coil projecting laterally therefrom, a connecting rod secured at one end to the free end of said coiland at the other end to said primary draft door for actuation of said draft door upon expansion and contraction of said coil.

11. In a stove or furnace having a jacket, a

primary draft door hingediy connected to said jacket, a draft regulator therefor comprising a pair of spaced arms pivotally secured at one end to said jacket, and said arms lying along the outer wall of said jacket, a thermostatic coil positioned between the free ends of said arms and having its inner end secured to said arms,

the free end of said coil projecting laterally 7 therefrom, a connecting rod secured at one end to the free end of said coil and at the other end to said primary draft door for actuation of said draft door upon expansion and contraction of said coil, andmeans for manually shifting the entire coil toward and away from said jacket.

PAUL WINGERT. 

